Which file do I need to edit to change front page graphics?

[reggiep]

Hi,
I keep going through those phases where I delve into php and then don't. I'm on a don't at the moment.
I am trying to see what I would need to edit to reduce the height of the changing graphics at the top of the front page.
I foolishly just edited the graphics but they ended up smaller but on a black background!
Can somebody point me in the right direction?

Thanks

[SYSMAN_MK]

This can be done via the slideshows component settings. Which one are you using?

[reggiep]

Slideshow settings did it. Thanks